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Fair Value (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Liabilities, Fair Value Disclosure [Abstract]    
Contingently convertible Series E units liability, Beginning Balance $ 66,938amh_ConvertibleSeriesEUnits  
Contingently convertible Series E units liability, Issuances   64,881amh_ConvertibleSeriesEUnitsLiabilityIssuance
Contingently convertible Series E units liability, Remeasurement included in earnings 5,119amh_ReMeasurementOfSeriesE 2,057amh_ReMeasurementOfSeriesE
Contingently convertible Series E units liability, Ending Balance 72,057amh_ConvertibleSeriesEUnits 66,938amh_ConvertibleSeriesEUnits
Preferred shares derivative liability, Beginning Balance 28,150us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability  
Preferred shares derivative liability, Issuance 23,652amh_PreferredDerivativeLiabilityIssuance 26,340amh_PreferredDerivativeLiabilityIssuance
Preferred shares derivative liability, Remeasurement included in earnings 6,158amh_PreferredDerivativeLiabilityRemeasurement 1,810amh_PreferredDerivativeLiabilityRemeasurement
Preferred shares derivative liability, Ending Balance $ 57,960us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability $ 28,150us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability